Question

Which of the following reactions is not of the first order?

Options

• Inversion of sucrose in the presence of acid.

• Acid-catalyzed hydrolysis of ethyl acetate.

• Hydrolysis of tertiary butyl halide using alkali.

• Oxidation of I⁻ ion by `"S"_2"O"_8^(2-)` ion.

Answer 1

Oxidation of I⁻ ion by `bb("S"_2"O"_8^(2-))` ion.

Explanation:

It is a second-order reaction, first-order both w.r.t \[\ce{S2O^{2-}_8}\] and I⁻.

∴ r = \[\ce{k[S2O^{2-}_8] [I^-]}\]

All other options are of a first-order reaction.